Anthill

From the introduction:

Anthill is a roleplaying game. Players take on the role of mutated ants in a post-apocalyptic landscape. These ants and those like them - collectively “the Changed,” although their individual changes vary greatly - must work together to protect their home (“the Hill”) from predation, disaster, and collapse. The world is strange and full of new, unpredictable dangers, and the Changed undergo frequent metamorphoses through exposure to the mutagenic waste that infects the landscape.

User summary:

This game was entitled Antics during the first two iterations of the competition.